Yes, a BCOM graduate can do data science. You just need to have a minimum of a UG degree in any specialization to become a Data Scientist. Having a UG degree is a requirement for most of the entry-level Data Science jobs. The relevant disciplines to become a Data Science are Finance, Economics, Maths, Statistics, Computer Science, and Information Management.
If you are from non IT background, you need to showcase your skills and build a strong profile showing your skills to become a Data Scientist. So, enroll for a certification course from recognized institutes and add them to LinkedIn, uploading your best projects on GitHub, and writing blogs explaining your projects.
You can learn data science by joining this Data Science Course by Intellipaat.
Also, watch this video on Data Science for beginners to understand more: